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Hewlett Packard Enterprise Java Developer Interview Questions and Answers

Updated 9 Oct 2024

Q1. What are all Java 8 features and explain the one which we have used in our project

Ans.

Java 8 features include lambda expressions, functional interfaces, streams, and more.

  • Lambda expressions allow concise syntax for defining anonymous functions.

  • Functional interfaces can have only one abstract method and are used for lambda expressions.

  • Streams provide a way to process collections of objects in a functional style.

  • Optional class helps to avoid NullPointerException by wrapping a value that may be null.

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Q2. CICD tools which we have used explain in high level

Ans.

CICD tools automate the process of building, testing, and deploying code changes.

  • Popular CICD tools include Jenkins, GitLab CI/CD, CircleCI, and Travis CI

  • These tools help in automating the software development lifecycle

  • They enable continuous integration, continuous delivery, and continuous deployment

  • CICD tools help in improving code quality, reducing manual errors, and increasing development speed

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Q3. What are primitive and non primitive data types

Ans.

Primitive data types are basic data types provided by the programming language, while non-primitive data types are created by the programmer.

  • Primitive data types include int, float, double, char, boolean, etc.

  • Non-primitive data types include arrays, classes, interfaces, etc.

  • Primitive data types store actual values, while non-primitive data types store references to objects.

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Q4. What are access modifiers and non access modifiers

Ans.

Access modifiers control the visibility of classes, methods, and variables. Non-access modifiers provide additional functionality.

  • Access modifiers: public, private, protected, default

  • Non-access modifiers: static, final, abstract, synchronized

  • Example: public class MyClass { private int myVar; }

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Q5. What is containerization

Ans.

Containerization is a lightweight, portable, and self-sufficient way to package and run applications.

  • Containerization involves encapsulating an application and its dependencies into a container image.

  • Containers are isolated from each other and share the host OS kernel.

  • Popular containerization platforms include Docker and Kubernetes.

  • Containerization allows for easy deployment and scaling of applications.

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Q6. What is indexing in sql

Ans.

Indexing in SQL is a technique used to improve the performance of queries by creating a data structure that allows for faster retrieval of data.

  • Indexes are created on columns in a database table to speed up the retrieval of rows that match a certain condition in a query.

  • They work similar to the index in a book, allowing the database to quickly locate the rows that satisfy the query.

  • Indexes can be created using a single column or a combination of columns, depending on the quer...read more

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